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The former deputy prime minister, who became the social media firm's chief lobbyist last year, told senior EU officials that plans to protect users' personal messages could "outlaw" its current relationship with online advertisers, according to documents unearthed by The Sunday Telegraph.

The warning was made in one of a series of private meetings Sir Nick has held with European and UK figures as he tries to influence ministers and officials planning crackdowns on social media companies as part of growing concerns about online privacy, abuse, and disinformation....